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采用模型试验与曲线拟合法 ,对砂浆和混凝土所形成的不同角度界面的试件进行轴向拉伸试验 ,导出界面开裂时正应力和剪应力的关系表达式 ,以此作为界面开裂判据。给出了钢锚索与沙浆接触面的开裂准则 ,提出了界面滑动位移与摩擦力之间的关系表达式。采用多体界面问题的边界积分方程 ,推导出计算锚固长度的边界单元方法 ,并给出了有关的算例 .计算与试验结果对比表明 ,本文提出的方法是可靠的
Using the model test and the curve fitting method, axial tensile test was conducted on specimens with different angle interfaces formed by mortar and concrete. The relational expression between normal stress and shear stress at interface cracking was derived and used as the criterion for interface cracking. The cracking criterion of the contact surface between steel anchor and mortar is given, and the expression of the relationship between the sliding displacement and the friction force is proposed. The boundary element method for calculating the anchorage length is deduced by using the boundary integral equation of the multibody interface problem and the relevant examples are given. Comparing the calculated results with the experimental results, the proposed method is reliable